Static eliminator



De@ 15, 1931. .1. A. Busi-10P STATIC ELMINATOR Original Filed March 29, 1928 2 Shefeics-Slet fil/enfer.

Dec. 15, 1931. J. A. BlsHoP STATIC ELIMINATOR Original Filed Ma'rch'ZS. 1928 2 Sheets-Sheet 2 /NJULA T/o/v /af atc,

Patented Dec. l5, 1931 f UNI-TED STATE-sf P ATE-NT oFF-15gg JAMES A. BISHOPQDECEASED; LATE or" Mascou'rnrr, ILL'INoIs', BY" IULUAH. BISHOP,

ADMINISTRATRIX, oF MAsCoUTAH, ILLrNoIs Y the presence of static.

sra'rrc ,ELIMINATOR Application filed March 29, 192l5,A Serial No. 265,591. Renewed June 11, 1931.

This invention has todo with improvements in radio'reception andthe like. It has todo particularly with improvements in means for eliminating interference due to The present invention constitutes in some respects anv improvement over theV co-pending application for Letters Patent of the United States, Serial'No.

115,007, which was liledJune 10, 1926, and U became Letters Patent No. 1,689,224, issued October 30, 1928. ln that application there is disclosed certain :apparatus and a system for separating and Vdissipatingthe static interference from the `radio signals, in which system and apparatus useismade of a system of magnetic shieQds or shields of magneticv material surrounding or in conjunction with the conductors which carry the radio signals prop er.- That application also discloses an selves to the supplementing influences `of a magneto-motive force the strength of 'which may beV regulated by the user.

This control ofthe magnetization vof the" the aerial. This condenser is provided with a ground connection to discharge any bolt 'of static that may be deposited therein. However, by reason of the'control of the magnetic condition of the shield there is maintained an equilibrium of electro-magnetic lines of ThisV is a force between the polar terminals, the aerialv connections, and the condenser plates.

:ln-the drawings has been illustrated a con# struction ot device embodying the features of the present'inventionv in which vFigure 1 shows a plan view of an vassembled device embodying the features of the presentinvention vand mounted upon acommon base board;

Fig; 2 shows a side elevation corresponding to Fig. 1;

F ig. 3 showsa cross section on the line 3--3f rows and 4von enlarged scale, being'a sectionv netic lamination plates lare individually con-` nected to thel various tubular magnetic shields.

In,l the construction shown in the-drawings there vis provided'a series of magnet core`s7, 8, 9L andflO respective-ly.1 These are all magnetized-I in such a manner that they are of the same'polarity' at `one sideof' the 'structure andl of the oppositeV polarity at the other side.`

The left hand ends whenfviewed as in Figs. 1 and 2 are 'of northfpol'arity and theright hand ends are of south polarity.l

The magnets themselves maybe either permanent or electro-magnets but preferably thev latter since by this meansit ispossible to control the degree of magnetizationvery closely. Furthermore, it is possible by the use Vof electromagnets to operate at a higher degree of magnetization than is practically feasible with permanent magnets.

Accordingly there are illustrated the solenoids 11, 12, 13 and 14y on the respective mag` net bars, 7 8, 9 and 10. These solenoids are preferably in series with the electrical terminals and 16. By this means the magnetiza- CII CIO

tion of the entire group is simultaneously cor.- trolled.

The windings of the solenoids are in such directions as compared to the electrical connections between them, as to inagnetize all of the bars north pole at one and south pole at the other end as shown in Figs. l and 2.

The incoming radio signal currents are -aused to flow in proximity to the north inagnctic orl positive magnetic poles. Any convenient arrangement may be used for accomplishing this result but preferably one in which the maximum effect and greatest benci'it per unit of energy expended will be produced.

With the above object in view it is preferred to .provide a series of tubular magnetic shields 17, preferablyrin two layers as clearly indicated in Figs. 2 and 5, and there preferably being an even number of such shields in each layer. These shields are preferably made of spirals of soft magnetic wire although obviously other constructions may be adopted.

In order to insure a maximum degree of magnetic contact and influence between the cores 7, 8, 9 and lO and the shields, the cores are preferably made of flat laminations in sulicient number sothatthe consecutive lan inations may be curled around and envelop therespective magnetic shields as indicated in Figs. 2 and 5. For this purpose there are preferably as many laminations in each core as there are magnetic shields, namely, twenty.

The attaching ends of the laminations ar also preferably flexed forward slightly adjacent to'thepoiiits where they wrap around the shields so as to provide a slight amount of springiness or resiliency at these points of support. K This iswell shown in F im 5, and willserve to eliminate trouble and interferlence due to slight mechanical vibration of the device.

Preferably also there aie tubes of non-mag netic material v18 laid intermediate between the consecutive shieldsof both layers, and' a tween the solenoids and each of the magnetic shields close thereto. This fact is eviden from Fig. 5 in particul-ar.

The incoming radio signal currents are carried by conductors passing through the shields and thus subject directly to the influencc of said shields. These conductors are-,so woven back and forth through the shields asto substantially elimina-te self-capacity while being fully subjected to the magnetic influence of the north magnetic pole. For this'puipose the incoming aerial lead-in connects to the connection 19 which divides into the two wires 2O and 2l in parallel. The

Wife 20 passes across through the first top shield to the left, then down diagonally and back through the thirdbottom shield to the right; and up diagonally and across the fth top shield to the `left, then down diagonally and back through the seventh bottom shield to the right; then up diagonally and across through the ninth top shield to the left; then down diagonally and through the tenth bottom shield to the right; then up diagonally and across through the eighth top shield to the left; then down diagonally and back through the sixth bottom shield to the right; then up diagonally and across through the fourth top shield to the left; then down diagonally'and back through the second bottom shield tothe richt where it comes out adjacent to the point where it first entered.

The other wire is woven back and forth through the unoccupied shields in a manner similar to the above explanation for the wire 20, except that it occupies a lower shield in place of each of the upper shields occupied by the wire 2O and then occupies an upper shield in place of each of the lower shields occupied by the wire 20.

The terminal ends of both of the wires 20 and 2l are joined together as shown at 22, and this terminal is then connected to the aerial connection of the receiving` set. It will be noted that the above system of splitting the incoming circuit into two parts makes it possible to so weave the wires back and forth as to secure perfect cooperation and influence from the magnetic shield, while at the same time entirely eliminating any interference due to self capacity.

The other or south magnetic ends of the cores 7, 8, 9 and l() are connected to a condenser 23 which serves as a storage reservoir for use in connection with particularly heavy drains on the system. This condenser com prises a series of laminations or plates 24 and another series of such plates 25, the plates ofthe two series criss-crossing each other as best shown in Fig. l. There is also another series of said plates 26 extending straight across the condenser. Each of the plates 26 is wrapped or protected with a covering of Y silk or similar high electrostatic material 27, similar non-magnetic tube'is also laid bepreferably wrapped around such plate 'as is clearly evident from Fig. 3. Furthermore thevends of the plates 26 are also mounted on the binding posts28 and 29 upon which they may be tightened up.

Due to the fact that the plates 24 and 25 cross between the plates 26 and the insulating layers 27 it is preferred to place washers or the like 28 on the bindingr posts intermediate between the ends of the plates 26 so that when the nuts 29 are tightened up on the binding posts the plates 26 will not have their ends seriously distorted.

Plates 25 and 26 are grounded by a ground wire 30 connected together at a convenient point as shown in Fig. l.

Manifestly the magnetizing current sup plied to the solenoids may be controlled in any convenient manner, but for purposes of illustration there is shown in Fig. l diagram- Sii non-magnetic material between the tWo cen tral laminations of each polar group so as to improve the distribution of the magnetic effeet to the shields of the top and bottom layer.

It Will generally be found desirable to op` erate the magnetic system up to a rather highv degree of saturation so that the operation is above the knee of the magnetization curve.

While there has herein been shown and described only a single embodiment of the features of the present invention still it is not intended to limit the invention thereto except as it may be so limited in the claims.

What is claimed is:

1. In a radio signal receiving system, the combination with a conductor for incoming radio frequency currents,vof means for reducing static interference including a magnetic shield embracing said conductor, a solenoid in conjunction'vvith said magnetic shield and serving to magnetize the same to create a north magnetic ield in the shield, and means for regulating the strength of a with the other pole of said magnet and directly influencing the same, substantially as described.

- 6. In a device of the class described, the combination of a conductor for radio frequency currents comprising a pair of Wires in electrically parallel relationship, a. series of tubular shields of magnetic material surrounding said vvires, a series of bar magnets having their cores formed of laminations, the

end portions of the laminations being in contact With the individual shields, vand means Y for individually magnetizing the bar magnet-s aforesaid, substantially as described.

7 In a device of the class described, the combination of a conductor for radio frequency current-s comprising a pair of Wires in electrically parallel relationship, individual tubular shields of magnetic material surrounding said Wires, the Wires and shields being interlooped to establish a neutralized self-capacity condition, and means for creating a magnetic field with all of said shields located in the north magnetic pole thereof, substantially as described.

LULU H. BISHOP, Admz'm'stmtm'm of James A. Bishop, De'- ceased.

magnetizing currentin said solenoid, sub- Y stantially as described.

2. In a radio signal receiving system, the combination with a conductor for incoming radio frequency currents, of means for reducing static interference including a magnetic shield in proximity to said conductor and constituting the northmagnetic pole of a magnetic system, substantially as described.

3. In a radio signal receiving system, the combination With a conductor for incoming radio frequency currents, of means for reducing static interference including means under the control of the operator for creating a magnetic field in proximity to said conductor and of desired strength andpolarity, substantially as described.

4. In a radio signal receiving system, the combination with a conductor for incoming radio frequency currents, of means for reducing static interference including a bar magnet having one pole in close proximity to said conductor and directly influencing the same, a condenser in conjunction With the other pole of said magnet and directly infiuencing the same, and means for controlling the strength of magnetism in said magnet, substantially as described.

5. In a radio signal receiving system, the combination with a conductor for incoming radio frequency currents, of means for reducing static interference including a bar magnet having one pole in close proximity to said conductor and directly influencing the same, and a condenser in conjunction 

